Thanks! I ended up modifying your code a little bit for a final result that we liked.

#top .sidebar_left .widget_nav_menu ul ul li:before {
display: none;
}

#top .sidebar_left .widget_nav_menu ul ul li {
font-weight: 400;
}

I believe I was able to solve it by using the following line of code added to the Quick CSS:

.av-layout-grid-container {
padding-left: 0;
padding-right: 0;
}